.hng-blue-card{max-width:820px;margin:18px auto;border-radius:10px;overflow:hidden;box-shadow:0 6px 18px rgba(17,24,39,0.06);font-family:Inter,ui-sans-serif,system-ui,Arial,Helvetica,sans-serif}
.hng-blue-header{background:linear-gradient(90deg,#0b74ff,#0066d6);color:#fff;padding:22px 20px}
.hng-blue-header h2{margin:0;font-size:20px;letter-spacing:0.2px}
.hng-blue-sub{margin:6px 0 0;font-size:13px;opacity:0.95}
.hng-blue-body{background:#fff;padding:18px 20px 22px;border-top:1px solid rgba(11,116,255,0.06)}
.hng-blue-body label{display:block;margin-top:8px;font-weight:600;color:#0b3559}
.hng-blue-body input[type='text'], .hng-blue-body select{width:100%;padding:10px;margin-top:6px;border:1px solid #e6eefb;border-radius:8px;box-sizing:border-box;background:#fbfdff}
.hng-row{display:flex;gap:12px;margin-top:8px;flex-wrap:wrap}
.hng-col{flex:1;min-width:140px}
.hng-btn-primary{background:#0b74ff;color:#fff;border:none;padding:9px 14px;border-radius:8px;cursor:pointer;font-weight:600;box-shadow:0 4px 10px rgba(11,116,255,0.18)}
.hng-btn-outline{background:#fff;color:#0b74ff;border:1px solid #0b74ff;padding:9px 12px;border-radius:8px;cursor:pointer;margin-left:8px;font-weight:600}
.hng-output{margin-top:14px;padding:14px;border-radius:8px;border:1px solid #eef6ff;min-height:90px;background:linear-gradient(180deg,#fbfdff,#f7fbff)}
.hng-placeholder{color:#6b7280}
.hng-footer-note{margin-top:10px;font-size:13px;color:#374151}
.hng-loading{color:#0b74ff;font-weight:600}